Pressure actuated piston lock release



Dec. 6, 1938. E. ENGEL PRESSURE ACTUATED PISTON LOCK RELEASE Filed Aug.10, 19 57 ['2 van for:

- upon the other.

ignates a main pressure cylinder position by armed Dec. 6, 1938 PATENTOFFICE 2,139,185 rasssuan ACTUATED- PISTON LOCK RE- LEASE Ernst Eager,

Frankfort-on-thc-Main,

Germany,

assignorto Alfred Teves Maschinenund Armaturenfabrik Application August10,

Gesellschaft m. b. H., on-the-Main, Germany Frankfort- 19st,. Serial No.158,442 In Germany August 5 Claims. (or 121-40) The present inventionrelates to a pressure medium' actuated release for a lock which lockserves in known which is actuated by the same pressuremedium.

The particular characteristic feature of the apparatus according to thisinvention resides in the fact that, during the time of the operation ofreleasing the lock, the pressure medium actuated piston is not yet underthe influence of this pressure medium so that the actuation of thelocking bolt is not affected by the influence of pressure medium on thepiston, whereby the bolt may be rapidly and positively raised with onlya slight pressure of the pressure medium.

An exemplary embodimentof the invention is illustrated in theaccompanying drawing, where- Fig. 1 is a side sectional view of thedevice consisting primarily of pressure cylinder, a lock and releasemechanism and a pressure medium controlling, valve mechanism;

Fig. 2 isan enlarged side sectional view of the said valve mechanism.

According to Fig. 1, reference character I deshaving a main piston 2therein, urged to the right by spring la in cylinder I, or byotherresiliently yielding means which may be associated with theapparatus actuated by piston 2. Piston rod 3 connects the piston 2 tothe apparatus to be actuated thereby. Mounted on the main cylinder andextending transversely thereto is another cylinder 4, having a piston tiwhich is connected with locking bolt 1 through the piston rod 6, thepiston 5 and bolt being urged downwardly into locking spring 15. Thepiston 2 is provided with a locking abutment which is herein illustratedas a recess 2a, into which locking bolt 1 is adapted to seat.

Cylinder 4 is connected a valve housing 9 which may be mounted on theend of cylinder l opposite piston-rod 3, said valve housing serving alsoas a closure for pressure cylinder I. Another conduit l connects thevalve to the pressure medium source, for instance, a pump, reservoir orthe like.

The valve itself consists of two inter-nested, semi-independentlyoperating valves H and II the stems of which are telescopingly arranged,and the heads of which are arranged to seat one The resultant doublevalve as a whole is supported and pressedby spring l3, while a spring 14tends to retain smaller valve l2 on its seat in the head of valve II.

It is thus apparent that pressure from above through conduit 0' withmanner to immobilize a piston valve ll opens and the pressure ated meansfor withdrawing said valve ll downwardly totends to move large getherwith small valve I2 carried thereby against other hand,

the influence of spring l3. On the pressure from below tends to closelarge valve II, but to raise small valve I! from its-seat on the largevalv spring ll.

In operation the invention performs as follows:

Springs l3 and it:

are of such relative strengths that, upon introduction of the pressuremedium into conduits l0 and 8, piston 5 is moved first, spring l5 beingonly of sufficient strength to securely retain locking bolt 1, which isconnected to piston 5, seated in its recess in piston 2. Accordingly,locking bolt 1 is first raised out of its recess in piston 2 until thecollar l6 of the locking bolt comes into contact with stop I! projectinginto cylinder 4. Only then is the force of spring 13 in valve housing 9overcome so that medium can also flow into cylinder I through openingl8. Upon release of the piston 2 by the locking bolt, and application ofpressure thereto by the abovedescribed procedure, piston 2 is moved tothe left, actuating the apparatus connected to piston rod 3.

Upon release of the pressure on piston 2, the piston returns to itsoriginal position, this movement being effected by the action of aspring la or the like, or by resilient means associated with theapparatus actuated by the piston (not illustrated). The pressure mediumon the right side of the piston 2 must then be able'to return to thesource thereof through valve housing 9 and conduit Hi. This is thepurpose of the openings l9 provided in valve head H and of valve I!which ordinarily closes these openings, the pressure of spring M onvalve it yields directly dium.

What I claim is:

1. Pressure-actuated piston lock release comprising in combination acylinder having a piston therein, said piston having a locking abutment,a source of fluid pressure medium for actuating the piston, a lockingbolt adapted to engage the locking abutment of the .piston to retain thepiston in non-operating position, pressure actubolt from the pistonlocking abutment to release the piston, a system of conduits connectingthe cylinder and the pressure actuated boltwithdrawing means with saidsource of fluid pressure medium, and valve means-connected in saidsystem of conto the returning pressure mehead against the influenceoi I!being so slight that pressure medium to the with the source of fluidduits serving to supply fluid pressure medium to the bolt withdrawingmeans in advance of the cylinder so as to release the piston look beforeapplying actuating force to the piston, said valve means having springcontrol and regulating means serving to limit the residual pressure onthe piston when not in operation 2. Pressure actuated piston lockrelease comprising in combination a cylinder having a piston therein,said piston having a locking abutment, a source of fluid pressure mediumfor actuating the piston, a locking bolt adapted to engage the lockingabutment of the piston to retain the piston in non-operating position,pressure actuated means for withdrawing said bolt from the pistonlocking abutment, a system of conduits connecting the cylinder and thepressure actuated bolt withdrawing means with said source of fluidpressure medium, and a double valve having internested heads adapted toopen under the influence of pressure in opposite directions connected insaid system of conduits serving to supply fluid bolt withdrawing meansin advance of the cylinder so as to release the piston lock beforeapplying actuating force to the piston.

3. Pressure actuated prising in combination main piston therein, saiding abutment, a source of fluid pressure medium for actuating thepiston, a locking bolt adapted to engage the locking abutment of themain piston, bolt actuating means including a cylinder and piston forwithdrawing said bolt from piston locking position, spring means urgingsaid bolt into locking position, conduits connecting the main cylinderand the bolt actuating cylinder pressure medium, and valve means forcontrolling flow of fluid pressure medium to the main cylinder andcomprising a pair of inter-nested valves having a spring urging saidvalves closed against the fluid pressure mepiston lock release coma maincylinder having a piston having a lockdium supplied from said source,said valve spring being of greater strength than the bolt urging spring,so that the bolt is withdrawn from piston locking position in advance ofthe application of fluid pressure medium to the main piston.

4. Pressure actuated piston lock release co.m

prising in combination a cylinder having a piston therein, said pistonhaving a locking abutment, a source of fluid pressure medium foractuating the piston, a locking bolt adapted to engage the lockingabutment of the piston to retain the piston in non-operating ated meansfor withdrawing said bolt from the piston locking abutment, a system ofconduits connecting the cylinder and the pressure actuated boltwithdrawing means with said source of fluid pressure medium, and valvemeans connected in said system of conduits serving to supply fluidpressure medium to the bolt withdrawing means in advance of the cylinderso as to release the piston look before applyingactuating force, to thepiston, said valve means comprising a pair' of inter-nested valves, oneof which is mounted on the other, said other valve having an opening forreturn of fluid pressure medium from the cylinder, said one valveserving to close said opening against flow of fluid pressure mediumtoward said cylinder, but to open under the influence of pressure fromthe direction of the cylinder.

5. Pressure actuated piston lock release comprising in combination acylinder having a piston therein, said piston having a locking abutment,a source of fluid pressure medium for actuating the piston, a lockingbolt adapted to engage the locking abutment of the piston to retain thepiston in non-operating position,-pressure actuated means forwithdrawing said bolt from the piston locking abutment, conduitsconnecting the cylinder and the pressure actuated bolt withdrawing meanswith said source of fluid pressure medium, valve means connected in saidconduits serving to supply fluid pressure medium to the bolt withdrawingmeans in advance of the cylinder so as to release the piston lock beforeapplying actuating force to the piston, a housing in which saidvalvemeans is located, said housing being connected to the cylinder andserving as a closure for said connection, and valve means for allowingreturn of fluid from the cylinder to the conduits, said last-mentionedvalve means having spring control means serving to limit the fluidpressure on the piston when not in operation.

ERNST ENGEL.

position, pressure actu-

